Syria has suffered its worst bloodshed since Bashar al-Assad was toppled from power, with more than 1,000 people reported killed in violence that has swept the coastal region since Thursday.

The killings occurred in the heartland of Syria’s Alawite minority, escalating after a nascent insurgency formed against the Sunni Islamist government.

The violence that has killed hundreds across Syria reached Damascus and Aleppo on Monday, after Ahmed al-Sharaa vowed to bring those responsible to justice.

Syria’s interim government has announced the end of a days-long military operation against insurgents loyal to ousted president Bashar Assad and his family in the worst fighting since the end of the 13-year civil war in December.

The days-long conflict has been among Syria's deadliest in a decade. Nearly 1,000 civilians have been killed, including women and children, according to the Syrian Observatory for Human Rights.

The announcement comes as the fighting between pro-Assad militias and members of the security forces killed more than 1,000 people, majority of whom are civilians, amid reports of rights violations.